Meghalaya Leopard Snakehead
Channa paradalis
- Adult size
- ≤ 5.9" (≤ 15 cm)
- Aquarium size
- 106 US gal (400 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
- Temperament
- Aggressive
- Zone
- Bottom to middle swimmer
- Temp
- 68–82°F (20–28°C)
Aquarium Fish Database
Explore freshwater aquarium fish by care level, size, temperament, swimming zone, water parameters, and compatibility.
Melanzona Guppy
Poecilia parae
- Adult size
- ≤ 2" (≤ 5 cm)
- Aquarium size
- 14 US gal (54 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 73–81°F (23–27°C)
Melon Barb
Haludaria fasciata
- Adult size
- ≤ 2.4" (≤ 6 cm)
- Aquarium size
- 21 US gal (81 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 72–79°F (22–26°C)
Mendezi Dwarf Cichlid
Apistogramma mendezi
- Adult size
- ≤ 2.8" (≤ 7 cm)
- Aquarium size
- 24 US gal (90 L) or larger / ≥ 39.4" (≥ 100 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 73–84°F (23–29°C)
Merry Widow Livebearer
Phallichthys amates
- Adult size
- ≤ 2.8" (≤ 7 cm)
- Aquarium size
- 16 US gal (60 L) or larger / ≥ 15.7" (≥ 40 cm) minimum length
- Temperament
- Peaceful
- Temp
- 73–79°F (23–26°C)
Mexican Tetra
Astyanax mexicanus
- Adult size
- ≤ 4.7" (≤ 12 cm)
- Aquarium size
- 20 US gal (75 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle swimmer
- Temp
- 68–77°F (20–25°C)
Mimicry Otocinclus
Otocinclus mimulus
- Adult size
- ≤ 1.8" (≤ 4.5 cm)
- Aquarium size
- 30 US gal (112 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 72–79°F (22–26°C)
Mini Rosy Tetra
Hyphessobrycon dorsalis
- Adult size
- ≤ 1.2" (≤ 3 cm)
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 73–82°F (23–28°C)
Miniature Pencilfish
Nannostomus anduzei
- Adult size
- ≤ 0.8" (≤ 2 cm)
- Aquarium size
- 11 US gal (41 L) or larger / ≥ 17.7" (≥ 45 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 72–82°F (22–28°C)
Mirabilis Eartheater
Geophagus mirabilis
- Adult size
- ≤ 7.9" (≤ 20 cm)
- Aquarium size
- 79 US gal (300 L) or larger / ≥ 59.1" (≥ 150 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle swimmer
- Temp
- 72–86°F (22–30°C)
Molly
Poecilia latipinna
- Adult size
- ≤ 4.7" (≤ 12 cm)
- Aquarium size
- 53 US gal (200 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
- Temperament
- Peaceful
- Temp
- 72–79°F (22–26°C)
Monica’s Tetra
Moenkhausia monicae
- Adult size
- ≤ 2" (≤ 5 cm)
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 72–79°F (22–26°C)
Monkey Goby
Neogobius fluviatilis
- Adult size
- ≤ 7.9" (≤ 20 cm)
- Aquarium size
- 20 US gal (76 L) or larger
- Temperament
- Peaceful
- Zone
- Bottom dweller
- Temp
- 39–68°F (4–20°C)
Montags Tetra
Hyphessobrycon montagi
- Adult size
- ≤ 1.2" (≤ 3 cm)
- Aquarium size
- 20 US gal (76 L) or larger
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 72–81°F (22–27°C)
Moonlight Gourami
Trichopodus microlepis
- Adult size
- ≤ 5.9" (≤ 15 cm)
- Aquarium size
- 40 US gal (150 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 72–86°F (22–30°C)
Morse Knifefish
Gymnorhamphichthys hypostomus
- Adult size
- ≤ 8.5" (≤ 21.5 cm)
- Aquarium size
- 53 US gal (200 L) or larger
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 77–82°F (25–28°C)
Motoro Stingray
Potamotrygon motoro
- Adult size
- ≤ 35.4" (≤ 90 cm)
- Aquarium size
- 449 US gal (1700 L) or larger / ≥ 94.5" (≥ 240 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom dweller
- Temp
- 75–79°F (24–26°C)
Mottled Ctenopoma
Ctenopoma weeksii
- Adult size
- ≤ 4.7" (≤ 12 cm)
- Aquarium size
- 26 US gal (100 L) or larger / ≥ 29.5" (≥ 75 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 73–81°F (23–27°C)
Mountain Redbelly Dace
Chrosomus oreas
- Adult size
- ≤ 2.8" (≤ 7 cm)
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 59–77°F (15–25°C)
Mousetail Knifefish
Gymnorhamphichthys rondoni
- Adult size
- ≤ 5.9" (≤ 15 cm)
- Aquarium size
- 53 US gal (200 L) or larger
- Temperament
- Peaceful
- Zone
- Bottom to middle swimmer
- Temp
- 77–82°F (25–28°C)
Moustached Danio
Danio dangila
- Adult size
- ≤ 4.7" (≤ 12 cm)
- Aquarium size
- 64 US gal (243 L) or larger / ≥ 47.2" (≥ 120 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 61–75°F (16–24°C)
Murray River Rainbowfish
Melanotaenia fluviatilis
- Adult size
- ≤ 3.9" (≤ 10 cm)
- Aquarium size
- 48 US gal (180 L) or larger / ≥ 35.4" (≥ 90 cm) minimum length
- Temperament
- Peaceful
- Zone
- Middle to top swimmer
- Temp
- 68–77°F (20–25°C)
Myer’s Hillstream Loach
Pseudogastromyzon myersi
- Adult size
- ≤ 2.4" (≤ 6 cm)
- Aquarium size
- 16 US gal (60 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom dweller
- Temp
- 68–75°F (20–24°C)
Napo Corydoras
Gastrodermus napoensis
- Adult size
- ≤ 2" (≤ 5 cm)
- Aquarium size
- 16 US gal (60 L) or larger / ≥ 23.6" (≥ 60 cm) minimum length
- Temperament
- Peaceful
- Zone
- Bottom dweller
- Temp
- 72–79°F (22–26°C)
